Cometic Buick 350 Small Block V8 .040in MLS Cylinder Head Gasket - 3.890in BoreCOMETIC MLS (Multi Layer Steel) Exhaust Gaskets are designed for extreme cylinder pressures. MLS Exhaust Manifold Gaskets maintain a torque set and resist corrosion. They will not burn through or push out. MLS Exhaust Manifold Gaskets withstand different combinations of cylinder head and exhaust manifold materials. No sealants are required. This Part Fits: Year Make Model Submodel 1973 1975 Buick Apollo Base 1975 Buick Apollo SR 1973 Buick Centurion